# Search results

1. ### An alpha particle is at rest at the origin of a Cartesian coordinate system

Homework Statement An alpha particle (the nucleus of a helium atom) is at rest at the origin of a Cartesian coordinate system. A proton is moving with a velocity of v towards the alpha particle in the xˆ direction. If the proton is initially far enough away to have no potential energy, how...
2. ### Question on Net Force

You can use impulse to solve this.
3. ### Electric Potential Energy concepts

Thank you for the response. I'm good with the directions and dot product, that makes sense. The difference between U and V is similar between F and E, so does this mean V is the potential of the field measured by a unit charge that doesn't effect the field? With U being the energy put into...
4. ### Electric Potential Energy concepts

Homework Statement What does the following equation mean and how is it analogous to the relationship between the electric field and the the electrostatic force? V ( ~r ) = U ( ~r ) / q In general, confused about concepts, meanings and vocabulary. The naming of different terms in this...
5. ### Electric Fields: Thin wire in conducting cylinder

Ok, I understand the idea of what you are saying. The charge on the wire won't go through the space between it and the cylinder, but the charge on the shell will move to cancel the field of the charge on the surface of the wire. It's tough to conceptualize this stuff from the textbook. Thanks...
6. ### Electric Fields: Thin wire in conducting cylinder

Hello PF, I am having a bit of difficulty understanding this question. Homework Statement "A thin wire with linear charge density λ is surrounded by a conducting cylindrical shell." (There is a hollow cylinder with a wire though it) "If the electric field must be zero inside a conductor, is...